Rear sight for rifles



mmx m Nov. 1'9, 1935.

H. C. CAMBRIDGE REAR SIGHT FOR RIFLES Filed OC'L. 24, 1954 2 Sheets-Sheet l Inventor Attorney wen.

NOV- 19, 1935- H. c. CAMBRIDGE REAR SIGHT FOR RIFLES Filed Oct. 24, 1934 2 Sheets-Sheet 2 Inventor /7/. Cla mm'aye By @un man.

Attorney wifi@ Patented Nov. 19, 1935 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to sights for rifles and has particular reference to a rear sight especially adapted for use on Krag rifles.

At the present time the rear sight on rifles, and especially on the type of rifle above referred to, requires the elevation bar to be raised to its fullest height, or entirely removed from the base, in order to remove the bolt from the rifle, thereby altering the range setting of the elevation bar and making it necessary to reset the elevation bar after replacing the bolt.

An object of the present invention is to provide a sight whereby after the elevation bar has been properly adjusted for the proper range, the adjustment thereof need not be disturbed in order to remove the bolt from the rie thus being a big improvement over the rifle sights as now used which require a rieman to alter the elevation setting of his sight to remove the bolt, and upon replacing the bolt waste both time and ammunition in the re-sighting of his sight.

The invention, together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein:

Figure 1 is a top plan View illustrating the application of the invention.

Figure 2 is a side elevational view of the invention.

Figures 3 and 7 are detail views taken substantially on the lines 3-3 and respectively, of Figure 2.

Figure 4 is a perspective view oi the elevation or range bar.

Figure 5 is a perspective view of a hinge block embodying the features of the present invention.

Figure 6 is a perspective view of a base member.

Referring to the drawings by reference numerals, it will be noted that the gun, a portion of which is shown fragmentarily in the drawings, is indicated by the reference numeral I0 while the bolt of the gun is indicated generally by the reference numeral The sight which is mounted at the rear of the barrel of the gun is indicated generally by the reference numeral I2.

In accordance with the present invention, the sight I2 includes the usual elevation bar I3 which is slotted as at I4 and graduated as at I5. The sight member is indicated by the reference numeral I6 and the base thereof operates within the slot I4 for the transverse adjustment of the sight through the medium of the adjusting screw I'I in the usual manner.

In accordance with the present invention, the

sight includes a base plate I8 which is suitably apertured so that the plate may be secured to one side of the gun and the stock thereof, and at the rear end of the barrel in the usual manner and through the medium of screws or other 5 fastening means I9. An important feature of the present invention is in providing the base plate I8 with a slot 20 in which works a hinge block 2| the same being provided with lateral vertical flanges 22 that engage the outer side of the plate I8 when the parts are in the full line position shown in Figure 3. At its base the block 2| is hinged to the plate I8 at the lower or inner end of the slot 20 in any suitable manner and through the medium of a hinge pin 23.

In its outer face the block 2| is provided with a mortise groove 24 in which slidably lits the slide 25 that is formed integral with or other- Wise secured to one end of the elevation plate I3. 'Ihe plate 25 on its outer face is provided 20 with the usual graduations for setting the range or elevation plate I3 at the desired range or elevation. For vertically adjusting the plate I3 there is provided the adjusting screw 26 that is threaded through the plate I3 and has its in- 25 ner end operating in a suitable recess 21 provided therefor at the top of the block 2|.

For releasably locking the block 2| in proper position, there is provided on the plate I8 at one side of the slot 20 a spring pressed plunger 30 28 that has an inner bevelled end adapted to engage in a recess 29 provided in one side of the block 2| to releasably lock the block 2| in posi.- tion within the slot 20. The stem of the plunger 28 operates through a suitable plug 3D in the 35 outer end of the bore provided in the plate I8 for accommodating the plunger. The plug 30 is secured in position through the medium of a machine screw 3|.

It will be apparent that when the sight is in 40 position on the gun and the proper adjustment of the elevation bar I3 and the sight I6 have been made, a removal of the bolt can be easily eiected by merely pulling outwardly on the plunger 28 to release the block 2| and subse- 45 quently to swing the block from the full line position to the dotted line position shown in Figure 3. With the block in the dotted line position shown in Figure 3 the bolt may be readily withdrawn, and after replacement of the 50 bolt, the block 2| is swung from the dotted line position shown in Figure 3 to the full line position shown in said figure. Upon movement of the block 2| into the full line position, the plunger 28 will engage with the recess 29 in the 55 block for releasably retaining the block and associated parts in proper position. It Will thus be seen that a movement of the block 2l and associated parts from one position to the other can be readily effected without disturbing the adjustment of the elevation plate I3 or the sight I6. Thus a removal and replacement of the bolt can be accomplished Without loss of time, and waste of ammunition as would be occasioned Where the adjustment of the elevation plate would be required in order to permit a removal oi the bolt.

Having thus described the invention, what is claimed as new is:

1. In combination with the elevation bar and base plate of a rear sight for riiies, a hinge block for the elevation bar hinged to the base plate on an axis longitudinal of the gun, and spring pressed plunger means carried by the base plate and engageable with the block for locking the block in operative position relative to the base plate.

2. In combination with the elevation bar and base plate of a rear sight for rifles, a hinge block for the elevation bar hinged to the base plate, said hinge block being provided with a groove, a slide integral With the elevation bar and engaging in said groove, and means for adjusting said slide to the desired vertical position, said hinge block, bar and slide being swingable laterally relative to the gun on an axis longitudinally of the latter.

3. In combination with the elevation bar and base plate of a rear sight for rifles, a hinge block for the elevation bar hinged to the base plate,

said hinge block being provided with a groove, a slide integral with the elevation bar and engaging in said groove, means for securing said slide at the desired vertical position, said hinge block, bar and slide being swingable laterally relative to the gun on an axis longitudinally of the latter, and means on the base plate engageable With the block for releasably retaining the said block in operative position relative to the base plate.

4. In combination With the elevation bar and base plate of a rear sight for rifles, a hinge block for the elevation bar hinged to the base plate on an axis longitudinally of the gun, said hinge block being provided with a mortise groove, a mortise slide integral with the elevation bar and slidably engaging said groove, and spring pressed plunger means carried by the base plate and engageable with the hinge block for locking the latter in operative position relative to the base plate.

5. In combination with the elevation bar and base plate of a rear sight for rifles, @hinge blnekmfof the.@llltlgmbarhpeed. v0 the base plate fwaiaxis' longitudinally of the' gun, a slide mounted on said hinge block and engaged with the elevation bar for supporting the latter at the desired elevation, a sight member on said demon bar and adjustable thereontra'nsverse- Uffmihand a spring pressed locking'element engaging the hinge block and the base plate for lasablyscuring the hinge block in operative position.

HOWARD C. CAMBRIDGE. 

